PRIME Minister Theresa May should not set any red line during Brexit negotiations in order to remain open to "last minute" changes in a possible deal with the EU, Tory MP Vicky Ford has declared.

Mrs Ford was one of 19 Tory Remainers who wrote to Theresa May to condemn Brexiteers' calls for the Prime Minister to walk away from the Brexit negotiations with no deal.

She said: "I have always said these are the most complicated negotiations of a generation.

"This is the point of our letter: don’t walk away from the negotiations. We want to find a deal.

"She said she wants to have a deep partnership, we support that. We also say ‘don’t fix any red line’ because she needs the negotiating space to come back with the best deal."

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Vicky Ford called on PM May to remain flexible to secure a Brexit deal with the EU

Speaking to Sky News, the MP for Chelmsford said flexibility is an important element of negotiations with Brussels due to possible "last minute" opportunities to reach a consensus on the Brexit deal.

Mrs Ford, a former MEP for the East of England, said: "My experience of European negotiations – I spent eight years in the European Parliament before coming to Westminster – is that often last minute things come up that you weren’t expecting.

"It’s very important to keep as much flexibility as possible in the negotiations which is why I think the responsible thing to do is say to the Prime Minister ‘keep your flexibility.'

"Get through the first stage, take the time that you need and move on to the trade negotiations.”

In their letter, the Tory Remainers underlined Mrs May's long-time commitment to a "deep and special partnership with the EU" and said this will help bring people together from different sides of the EU referendum debate.

But Brexiteer MP Peter Bone told BBC host Jo Coburn he continued to back the PM and had offered his help in the negotiations with Brussels.

He said: "477 days to go, another day nearer coming out of this dreadful European Union superstate so that’s good news. Vicky can write letters if she wants.

"I'm 100 per cent behind the Prime Minister. In fact I understand the Prime Minister is thinking about taking me to Brussels to sort the problem out."

Mrs May has been facing growing turmoil after a failed attempt to strike a deal with the European Union on the Irish border – a deal that could have pushed EU leaders to vote in favour of discussing future trade arrangements at the upcoming December EU Summit in Brussels.